I've used the same virtual tour company for the last four years and recently began using a new virtual tour company due to its innovative marketing ideas.  I think that it is wonderful!  I am endorsing Previsite and I am not being compensated for this endorsement.

A colleague introduced me to Previsite since it provides innovative methods to marketing listings on multiple national and social networking websites.

Within a Previsite virtual tour, the photographs can be either a fisheye, stitched photos and still shots.  I believe that it is may be of the few companies that can accept all three formats in the same virtual tour.  Since all formats are accepted, you can customize your virtual tour to your personal taste.

The fish-eye lense makes listing photos look true to its size.  It takes one snap of the camera to make the room true to its size. The fish-eye lens can capture from one wall to another, floor to ceiling.  It's ideal for depth perception.  I've tried it and found that even small rooms appear to be its true size.   Interesting that the picture needs to be taken at the belly button level since it provides the best depth display of the room.

I found that Previsite has an interesting social networking aspect.  Previsite has written a custom application to Facebook.  With a touch of the button, your virtual tours can be posted to Facebook and Twitter.  I am sure that as social networking continues to grow Previsite will probably be offering more products.

Since you will be taking your own pictures, you can change the pictures easily as the season changes or if there are any changes to the property.  You won't have to pay for changes.

According to the sales representative, Previsite daily syndicates to several websites.  

 Best of all, I feel that the monthly fee is extremely reasonable.